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A comment on A looming copper crunch and why recycling can’t fix it. Parent comment
50 Hz railway systems are probably more common than 50/3, at least in Europe:
https://en.wikipedia.org/wiki/Railway_electrification_system...
25 kV AC 50 Hz (60 Hz in countries using such grid frequency) is the modern standard: https://en.wikipedia.org/wiki/25_kV_AC_railway_electrificati...
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50 Hz railway systems are probably more common than 50/3, at least in Europe:
https://en.wikipedia.org/wiki/Railway_electrification_system...
25 kV AC 50 Hz (60 Hz in countries using such grid frequency) is the modern standard: https://en.wikipedia.org/wiki/25_kV_AC_railway_electrificati...